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  <h2 id="about_epub">关于 EPUB</h2>

  <p>The EPUB (electronic publication) format is one of the most popular file formats for ebooks. It is an open and freely available standard that can be used by anyone.</p>
  <p>EPUB（electronic publication）格式是电子书最受欢迎的文件格式之一。这是一个开放且免费的标准，任何人都可以使用。</p>

  <p>An EPUB ebook is simply a file containing several other files stored together using the common zip format. These files include your words, images, Table of Contents, stylesheets, fonts and details about your book like author or title. EPUB’s standard format means your book can be read on many ereaders or converted easily to other ereaders not using EPUB.</p>
  <p>EPUB 电子书只是一个文件，其中包含使用通用 zip 格式存储在一起的其他几个文件。这些文件包括您的文字、图像、目录、样式表、字体以及有关您的书的详细信息（例如作者或书名）。EPUB 的标准格式意味着您的图书可以在许多电子阅读器上阅读，也可以轻松转换为不使用 EPUB 的其他电子阅读器。</p>

  <p>Your EPUB stores your words and text in the book using the HTML format (Hyper Text Markup Language – the same code used by web pages to display text and images). This just means that the files contain your text along with markup codes and tags (like <span class="example">&lt;h1&gt;</span> or <span class="example">&lt;p&gt;</span>) which tell ereaders how to format and display the text – some words could be bold or italic, others could be a paragraph or a heading, etc.</p>
  <p>您的 EPUB 使用 HTML 格式（Hyper Text Markup Language 超文本标记语言 – 使用网页来显示文字和图像相同的代码）将单词和文本存储在书中。这只是意味着文件包含您的文本以及标记代码和标签（例如 <span class="example">&lt;h1&gt;</span> 或 <span class="example">&lt;p&gt;</span>) 告诉电子阅读器如何设置和显示文本格式 - 有些单词可能是粗体或斜体，有些则可能是段落或标题，等等。</p>

  <p>In addition to HTML tags to control or style the layout, EPUB books typically make use of stylesheets to help organise the use of styles used by the HTML files. A stylesheet is another file in the EPUB that contains a list of HTML tags along with instructions on how to display any text using that tag, e.g. <span class="example">&lt;h1&gt;</span> (heading level 1) should be larger and centered. This allows you to separate the content of your book from its layout and allows you to easily adjust the look of the EPUB.</p>
  <p>除了用于控制布局或设置样式的 HTML 标签外，EPUB 书籍通常还使用样式表来帮助组织 HTML 文件使用的样式的使用。样式表是 EPUB 中的另一个文件，其中包含 HTML 标签列表以及有关如何使用该标签显示任何文本的说明，例如 <span class="example">&lt;h1&gt;</span>（标题级别1）应更大且居中。 这样，您就可以将书籍的内容与版面分开，并轻松调整 EPUB 的外观。</p>

  <p>Of course, when anyone actually reads an EPUB they don’t see all these HTML files or stylesheets. The ereader just displays the text and images like a normal book – as close as it can to the formatting you defined, even if there are thousands of pages or files.</p>
  <p>当然，当任何人实际阅读 EPUB 时，他们都不会看到所有这些 HTML 文件或样式表。电子阅读器就像普通书本一样显示文本和图像，即使有成千上万的页面或文件，也应尽可能接近您定义的格式。</p>

  <p>You don’t have to understand all the details of the EPUB format or understand HTML formatting codes to start using Sigil. However, if you spend any time with Sigil you will soon need to become familiar with these areas in order to get the most out of the advanced features of Sigil, and, ultimately, to achieve the design you want.</p>
  <p>您无需了解 EPUB 格式的所有详细信息，也无需了解 HTML 格式代码即可开始使用 Sigil。但是，如果您花任何时间在 Sigil 上，您都将很快需要熟悉这些领域，以便充分利用 Sigil 的高级功能，并最终实现所需的设计。</p>

  <div class="tip">
    <p class="tiptext">Text files are actually stored in XHTML format (an XML compliant version of HTML), but to make the guide easier to read we’ll use HTML to refer to either HTML or XHTML.</p>
    <p class="tiptext">文本文件实际上是以 XHTML 格式（HTML 的 XML 兼容版本）存储的，但是为了使指南更易于阅读，我们将使用 HTML 来指代 HTML 或 XHTML。</p>
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  <p>Sigil is designed to work with version 2 of the EPUB standard, with support for some additional features found in EPUB 3.</p>
  <p>Sigil 旨在与 EPUB 标准的版本 2 配合使用，并支持 EPUB 3 中的一些其他功能。</p>

  <div class="tip">
    <p class="tiptext">Even though Sigil is designed to work with EPUB files, the EPUB format can easily be converted to other ebook formats like MOBI.</p>
    <p class="tiptext">即使 Sigil 旨在使用 EPUB 文件，EPUB 格式也可以轻松转换为其他电子书格式，例如 MOBI。</p>
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  <p>To learn more about HTML you can read various online guides, including:</p>
  <p>要了解有关 HTML 的更多信息，您可以阅读各种在线指南，包括：</p>

  <ul>
    <li><a href="http://www.w3schools.com/html/">W3Schools HTML 指南</a></li>
  </ul>

  <p>Help with on the EPUB format is available from EPUB users at MobileRead:</p>
  <p>EPUB 用户可通过 MobileRead 获得有关 EPUB 格式的帮助：</p>

  <ul>
    <li><a href="http://www.mobileread.com/forums/forumdisplay.php?f=179">EPUB Forum @ MobileRead</a></li>
  </ul>

  <p>If you really want to dig into the details of the official EPUB standard on which Sigil is built you can read the original technical specifications:</p>
  <p>如果您真的想深入了解构建 Sigil 的官方 EPUB 标准的详细信息，则可以阅读原始技术规范：</p>

  <ul>
    <li><a href="http://idpf.org/epub/201">Official EPUB 2.0.1 IDPF Standard</a> <br/> <a href="http://idpf.org/epub/30">Official EPUB 3.0 IDPF Standard</a> 

    <ul>
      <li><span class="listheading">OPS (Open Publication Structure):</span> The key specification which describes everything in an EPUB file.</li>
      <li><span class="listheading">OPS（Open Publication Structure 公开出版物结构）：</span>描述 EPUB 文件中所有内容的关键规范。</li>

      <li><span class="listheading">OPF (Open Packaging Format):</span> How the EPUB files relate to each other, metadata details (<span class="example">content.opf</span>).</li>
      <li><span class="listheading">OPF（Open Packaging Format 开放包装格式）：</span>EPUB 文件如何相互关联，元数据详细信息（<span class="example">content.opf</span>）。</li>

      <li><span class="listheading">OCF (OEBPS Container Format):</span> How files are packaged into a <span class="example">.epub</span> file.</li>
      <li><span class="listheading">OCF（OEBPS 容器格式）：</span>文件如何打包到一个 <span class="example">.epub</span> 文件。</li>
    </ul></li>
  </ul>

  <div class="tip">
    <p class="tiptext">You can <a href="https://github.com/Sigil-Ebook/sigil-user-guide/releases/latest">download the EPUB version of the Sigil User Guide</a>, which was created entirely in Sigil, and view it in Sigil to see an example of an EPUB ebook.</p>
    <p class="tiptext">您可以 <a href="https://github.com/Sigil-Ebook/sigil-user-guide/releases/latest">下载 EPUB 版本的《Sigil 用户指南》</a>，该版本完全在 Sigil 中创建，并在 Sigil 中进行查看，以查看 EPUB 电子书的示例。</p>
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